MAKEALL: cut down on duplication of targets

Merge the other significant source of board name duplication with the new
boards.cfg file.  I cleaned up most targets, but the ARM and MIPS trees
are such a mess than I didn't bother.  If those maintainers care, they can
take are of it.

While we're at it, we can be a bit more clever in the LIST_xxx handling
and avoid duplicating the list names too.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Reviewed-by: Ben Gardiner <bengardiner@nanometrics.ca>
Tested-by: Thomas Chou <thomas@wytron.com.tw>